Answer:
The prove is below
Explanation:
From trigonometric identities:

Therefore:

The Red Cross relies on its extensive chapter network as
its first level of response to disasters. This backbone of more than 800 chapters allows the Red Cross to respond quickly to disasters anywhere in the country, with a cadre of locally trained volunteers, also, the Red Cross has a large and strong partnership with several wealthy organizations who make the donation when needed.
It should also be noted that the Red Cross has people, systems and plans in place to respond to disasters.
The correct answer is A.
Your friend directly tells you to buy a product because of how good it is. This would be an example of a direct influence because he is telling you to your face to buy it. The other options would be indirect influence as you either overheard or read about his opinion on this product.